Modified polyurethane foams for fuel-fire
    3.
    发明授权
    Modified polyurethane foams for fuel-fire 失效
    用于燃料消毒的改性聚氨酯泡沫

    公开(公告)号:US3549564A

    公开(公告)日:1970-12-22

    申请号:US3549564D

    申请日:1968-02-05

    Applicant: NASA

    Abstract: 1,259,168. Fire retardant polyurethane foams. NATIONAL AERONAUTICS & SPACE ADMINISTRATION. 4 Feb., 1969 [5 Feb., 1968], No. 5817/69. Headings C3C and C3R. Semi-rigid or rigid polyurethane foams are rendered fire-retardant by having uniformly dispersed therein a halogenated polymer and an ionizable inorganic salt, the halogenated polymer being capable of splitting off hydrogen halide and the salt being dissociable on heating and charring of the polyurethane. Suitably the foam also contains an encapsulated, halogenated, volatilizable fire suppressant material. The foam is preferably prepared from polymethylenepolyphenylisocyanates and a polyether formed by reaction of propylene oxide with a sugar or sugar derivative e.g. methyl glucoside. The preferred halogenated polymers are polyvinyl chloride and a terpolymer of vinyl chloride, vinyl acetate and maleic anhydride. Potassium fluoborate is the preferred dissociable salt. Fluorohalocarbons are the preferred encapsulants and may be encapsulated by coascervation with gelatine or polyvinyl alcohol. The foam suitably has a non-foamed skin on its outer surfaces.

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